I have seen posts all about how no one knows who the lady is.
Well, to me it seems pretty obvious that, she is the personification of Earth (Gaia, if you will) I'm not sure how the seperate ladies work into it, or what FPW's exact type of mythology will be, but to me the clues are all there.
Im at work and dont have any of the books with me, so this isn't exact and I probably can't remember all the things that stuck out to me as I read the books, but bear with me.
Examples on why I think this: (just a few off the top of my head)
The Lady has said she is not with the Otherness or The Ally, she just wishes they would both just disappear and leave everyone alone.
The way the Ladies tell everyone that she is their "Mother" (as in Mother Earth)
When they are burying the totem type things into the Earth, she gets wounded on her back.
All this seems quite clear cut to me, and I'm surprised I haven't seen anyone else mention this idea, or have I just missed it? I wouldn't be surprised if this is something everyone else has thought of, I'm new to this board and haven't looked at everything, I just wanted to throw this out there and see what others though.